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GU-30

DOUBLE BEAM-POWER TETRODE

The GI-30 double beam-power tetrode is used in pulse-operation circuits of RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass, no-base.
Height: at most 110 mm.
Diameter: at most 61 mm.
Mass: almost 125g.

gi-30(1)00021.jpg
1 - heater; 2 - grid 2; 3 - common grid 2; 4 - cathode and beam-forming plates; 5,7- heater; 6 - grid 1 of first tetrode; A1 - anode of first tetrode; A2 - anode of second tetrode

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 20-200
acceleration, m/s² 59
Multiple impacts with acceleration, m/s² 343
Single impacts with acceleration, m/s² 1,470
Linear loads with acceleration, m/s² 240
Ambient temperature, °C -60 to+135
Relative humidity at up to +40 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage, V 12.6
Heater current, A 1-1.25
Anode current (at anode voltage 250 V, grid 1 voltage -11 V of first tetrode, grid 1 voltage -100 V of second tetrode, grid 2 voltage 175 V), mA 35-82
Grid 2 current (at anode voltage 250 V, grid 1 voltage -11 V of first tetrode, grid 1 voltage -100 V of second tetrode, grid 2 voltage 175 V), mA, at most 10
Interelectrode capacitance, pF:
input 13-17
output 5-9
transfer, at most 0.1
Warm up time, s, at most 50
Peak anode current over 1,000 h of service, A, at least 7.5

Limit Operating Values
Heater voltage, V 11.3-13.9
Anode voltage, kV 5
Grid voltage, V 850
Peak anode current, A 9
Dissipation, W:
anode 15
grid 2 3
Warm up time, s, at last 60
Envelope temperature, °C 200

gi-30(2)00031.jpg
Characteristic Curves Showing Anode Dissipation Pa max versus Ambient Temperature (at bulb temperature Tb 200 °C)